Package net.sf.jasperreports.j2ee.servlets

Source Code of net.sf.jasperreports.j2ee.servlets.AbstractXlsServlet

/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.j2ee.servlets;

import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRConstants;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.export.JRXlsAbstractExporter;
import net.sf.jasperreports.engine.export.JRXlsAbstractExporterParameter;
import net.sf.jasperreports.engine.util.FileBufferedOutputStream;

/**
* @author Ionut Nedelcu (ionutned@users.sourceforge.net)
* @version $Id: AbstractXlsServlet.java 4077 2010-12-08 14:43:05Z narcism $
*/
public abstract class AbstractXlsServlet extends BaseHttpServlet
{
  private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;

 
  /**
   *
   */
  public void service(
    HttpServletRequest request,
    HttpServletResponse response
    ) throws IOException, ServletException
  {
    List jasperPrintList = BaseHttpServlet.getJasperPrintList(request);

    if (jasperPrintList == null)
    {
      throw new ServletException("No JasperPrint documents found on the HTTP session.");
    }
   
    Boolean isBuffered = Boolean.valueOf(request.getParameter(BaseHttpServlet.BUFFERED_OUTPUT_REQUEST_PARAMETER));
    if (isBuffered.booleanValue())
    {
      FileBufferedOutputStream fbos = new FileBufferedOutputStream();
      JRXlsAbstractExporter exporter = getXlsExporter();
      exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperPrintList);
      exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, fbos);
      exporter.setParameter(JRXlsAbstractExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
      exporter.setParameter(JRXlsAbstractExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);

      try
      {
        exporter.exportReport();
        fbos.close();

        if (fbos.size()> 0)
        {
          response.setContentType(getResponseContentType());
          setResponseHeader(response);
          response.setContentLength(fbos.size());
          ServletOutputStream ouputStream = response.getOutputStream();
          try
          {
            fbos.writeData(ouputStream);
            fbos.dispose();
            ouputStream.flush();       
          }
          finally
          {
            if (ouputStream != null)
            {
              try
              {
                ouputStream.close();
              }
              catch (IOException ex)
              {
              }
            }
          }
        }
      }
      catch (JRException e)
      {
        throw new ServletException(e);
      }
      finally
      {
        fbos.close();
        fbos.dispose();
      }
//      else
//      {
//        response.setContentType("text/html");
//        PrintWriter out = response.getWriter();
//        out.println("<html>");
//        out.println("<body bgcolor=\"white\">");
//        out.println("<span class=\"bold\">Empty response.</span>");
//        out.println("</body>");
//        out.println("</html>");
//      }
    }
    else
    {
      response.setContentType(getResponseContentType());
      setResponseHeader(response);

      JRXlsAbstractExporter exporter = getXlsExporter();
      exporter.setParameter(JRExporterParameter.JASPER_PRINT_LIST, jasperPrintList);
     
      OutputStream ouputStream = response.getOutputStream();
      exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);

      exporter.setParameter(JRXlsAbstractExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
      exporter.setParameter(JRXlsAbstractExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);

      try
      {
        exporter.exportReport();
      }
      catch (JRException e)
      {
        throw new ServletException(e);
      }
      finally
      {
        if (ouputStream != null)
        {
          try
          {
            ouputStream.close();
          }
          catch (IOException ex)
          {
          }
        }
      }
    }
  }

 
  /**
   *
   */
  protected abstract JRXlsAbstractExporter getXlsExporter();
 
 
  protected String getResponseContentType(){
    return "application/xls";
  }
 
  protected void setResponseHeader(HttpServletResponse response){
    response.setHeader("Content-Disposition", "inline; filename=\"file.xls\"");
  }
 
}
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